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Title

Low strigolactone root exudation: A novel mechanism of broomrape (Orobanche and Phelipanche spp.) resistance available for faba bean breeding

AuthorsFernández-Aparicio, Mónica ; Kisugi, Takaya; Xie, Xiaonan; Rubiales, Diego ; Yoneyama, Koichi
KeywordsBroomrape
Venetic resistance
Vicia faba
Parasitic plant
Seed germination
Issue Date28-Jun-2014
PublisherAmerican Chemical Society
CitationJournal of agricultural and food chemistry 62(29): 7063- 7071 (2014)
AbstractFaba bean yield is severely constrained in the Mediterranean region and Middle East by the parasitic weeds Orobanche crenata, O. foetida, and Phelipanche aegyptiaca. Seed germination of these weeds is triggered upon recognition of host root exudates. Only recently faba bean accessions have been identified with resistance based in low induction of parasitic seed germination, but the underlying mechanism was not identified. Strigolactones are a group of terpenoid lactones involved in the host recognition by parasitic plants. Our LC-MS/MS analysis of root exudates of the susceptible accession Prothabon detected orobanchol, orobanchyl acetate, and a novel germination stimulant. A time course analysis indicated that their concentration increased with plant age. However, low or undetectable amounts of these germination stimulants were detected in root exudates of the resistant lines Quijote and Navio at all plant ages. A time course analysis of seed germination induced by root exudates of each faba bean accession indicated important differences in the ability to stimulate parasitic germination. Results presented here show that resistance to parasitic weeds based on low strigolactone exudation does exist within faba bean germplasm. Therefore, selection for this trait is feasible in a breeding program. The remarkable fact that low induction of germination is similarly operative against O. crenata, O. foetida, and P. aegyptiaca reinforces the value of this resistance. © 2014 American Chemical Society.
Publisher version (URL)http://dx.doi.org/10.1021/jf5027235
URIhttp://hdl.handle.net/10261/127653
DOI10.1021/jf5027235
Identifiersdoi: 10.1021/jf5027235
issn: 1520-5118
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